Camparison between Two and Four Stroke Engine

Four Stroke Engine
1. One power stroke for every two revolutions of the crankshaft.
2. There are inlet and exhaust valves in the engine.
3. Crankcase is not fully closed and air tight.
4. Top of the piston compresses the charge.
5. Size of the flywheel is comparatively larger.
6. Fuel is fully consumed. Fuel is not fully consumed.
7. Weight of engine per hp is high.
8. Thermal efficiency is high.
9. Removal or exhaust gases easy.
10. Torque produced is even.
11. For a given weight, engine would give only half the power of two stroke engine.
12. All types of speed are possible (high and low).
13. It can be operated in one direction only.

Two Stroke Engine
1. One power stroke for each revolution of the crankshaft.
2. There are inlet and exhaust ports instead of valves.
3. Crankcase is fully closed and air tight.
4. Both sides of the piston compress the charge.
5. Size of the flywheel is comparatively smaller.
6. Fuel is not fully consumed.
7. Weight of engine per hp is comparatively low.
8. Thermal efficiency is comparatively low.
9. Removal of exhaust gases comparatively difficult.
10. Torque produced is less even.
11. For same weight, two stroke engine gives twice the power that of four stroke engine.
12. Mostly high speed engines are there.
13. It can be operated in both direction (clockwise and counter clockwise).

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